An immature moray eel is called a leptocephalus, Latin for "small head.".    From Wordnik.com.  [Starbulletin Headlines] Reference

The larva of moray eels, called leptocephalus, get distributed throughout the oceans.    From Wordnik.com.  [Livescience.com] Reference

The hatched leptocephalus drift with the North Equatorial Current toward Philippine.    From Wordnik.com.  [OpEdNews - Diary: Dancing With Glass Eels] Reference

Trimesurus leptocephalus, Lacep.    From Wordnik.com.  [Journals of Two Expeditions of Discovery in North-West and Western Australia, Volume 2] Reference

Trimesurus leptocephalus.    From Wordnik.com.  [Journals of Two Expeditions of Discovery in North-West and Western Australia, Volume 2] Reference

Diopeus leptocephalus Cope.    From Wordnik.com.  [Transactions of the American Philosophical Society] Reference